CVE-2026-32178: .NET Spoofing Vulnerability

Overview

Severity

High (CVSS 7.5)

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C

Category

Spoofing

Exploit Status

Not Exploited

Exploitation Likelihood

Less Likely

Patch Tuesday

2026-Apr

Released

2026-04-14

Description

Improper neutralization of special elements in .NET allows an unauthorized attacker to perform spoofing over a network.

Affected Products (12)

Developer Tools

• Microsoft Visual Studio 2022 version 17.12
• Microsoft Visual Studio 2022 version 17.14
• .NET 10.0 installed on Windows
• .NET 10.0 installed on Mac OS
• .NET 10.0 installed on Linux
• .NET 8.0
• .NET 8.0 installed on Linux
• .NET 8.0 installed on Windows
• .NET 8.0 installed on Mac OS
• .NET 9.0 installed on Linux
• .NET 9.0 installed on Windows
• .NET 9.0 installed on Mac OS

Security Updates (5)

• Release Notes
• Release Notes
• 5086095
• 5086096
• 5086097

Acknowledgments

Ludvig Pedersen

Revision History

• 2026-04-14: Information published.